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CO2 Conversion into Methanol Using Granular Silicon Carbide (α6H-SiC): A Comparative Evaluation of 355 nm Laser and Xenon Mercury Broad Band Radiation Sources

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Abstract

Granular silicon carbide (α6H-SiC) was investigated as a photo-reduction catalyst for CO2 conversion into methanol using a 355 nm laser from the third harmonic of pulsed Nd:YAG laser and 500 W collimated xenon mercury (XeHg) broad band lamp. The reaction cell was filled with distilled water, α6H-SiC granules and pressurized with CO2 gas at 50 psi. Maximum molar concentration of methanol achieved was 1.25 and 0.375 mmol/l and the photonic efficiencies of CO2 conversion into methanol achieved were 1.95 and 1.16 % using the laser and the XeHg lamp respectively. The selectivity of methanol produced using the laser irradiation was 100 % as compared to about 50 % with the XeHg lamp irradiation. The band gap energy of silicon carbide was estimated to be 3.17 eV and XRD demonstrated that it is a highly crystalline material. This study demonstrated that commercially available granular silicon carbide is a promising photo-reduction catalyst for CO2 into methanol.

Graphical Abstract

Gas Chromatograms of reaction products collected at 30–120 min irradiation in the presence of 355 nm laser having 40 mJ/pulse energy. The inset shows the comparison of retention time of GC peaks with the methanol standard and it is at 2.46 min.

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Acknowledgments

This work was financially supported by King Fahd University of Petroleum and Minerals under the Deanship of Scientific research through approved the Laser Research Group projects # RG1011-1 and RG1011-2.The continuous support of the Physics Department is also acknowledged.

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Authors and Affiliations

  1. Laser Research Group, Physics Department and Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    Mohammed Ashraf Gondal, Mohamed Abdulkader Dastageer & Xiaofeng Chang

  2. Center for Refining and Petrochemicals, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    Mohammed Ashraf Ali

  3. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, China

    Xiaofeng Chang

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  1. Mohammed Ashraf Gondal
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  2. Mohammed Ashraf Ali
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  3. Mohamed Abdulkader Dastageer
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  4. Xiaofeng Chang
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Correspondence to Mohammed Ashraf Gondal.

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Gondal, M.A., Ali, M.A., Dastageer, M.A. et al. CO2 Conversion into Methanol Using Granular Silicon Carbide (α6H-SiC): A Comparative Evaluation of 355 nm Laser and Xenon Mercury Broad Band Radiation Sources. Catal Lett 143, 108–117 (2013). https://doi.org/10.1007/s10562-012-0916-z

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  • DOI: https://doi.org/10.1007/s10562-012-0916-z

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